12v electrics don't work without EHU
Hello another newbie here.
Just started to use our 2008 Bessacarr Cameo 625 for family holidays and noticed during a recent trip to Wareham Forest that my control panel would not switch off! I disconnected the EHU before leaving and the panel stayed on and just reported that it was
not charging the battery, which I expected due to no EHU. Now I pressed the button to the car setting (picture of car)? and the control panel powered off. The panel will not power on unless the EHU is present? I suspect the panel is detecting power from
the Sargent PX300 (similar) 3 stage charger but doesn't detect anything from the battery alone? I've checked what I can and the fuses all look ok and the panel had a new 3v battery for good measure.
A recent service said everything was ok from an electrical perspective but clearly something isn't working as it should.
All other battery operated stuff seems to work, such as the motor mover and Caralavel so the battery seems in good shape? The panel reads the battery info when EHU is present and that looked totally normal?
With no EHU the panel does not turn on so I can't switch the water pump on and none of the lights or 12v equipment works!
Any ideas welcome as it took months to get a service booked in, we're going away again end of May!!
Thanks